From Hey Arnold. Anyone remember him from the show?
This is what I think of him,
He seems to not understand other people because he gets clueless about how they act and why they are mad at him etc. he takes things literal, he is clumsy and his social skills aren't good. He also fails to think of other people and only thinks of himself.
In one of the episodes it sure showed it. His wife kicks him out and when Arnold tries to get them back together, they are on the roof having dinner and Arnold is about to serve them cupcakes. But he trips over Suzie's shoes and one of them falls in the tub where she is soaking her feet, and Oskar is about to eat his cupcake but he asks Suzie if she wants it or not and it's very small and she says "Not if you want it for yourself." She was being sarcastic but Oskar didn't know it so he says "Okay great," and eats it and his wife gets mad. Oskar doesn't understand what her problem is.
Also when they were dancing, he keeps stepping on her toes, that's a sign of clumsiness.
I don't know if he has it or not. The people who made the shows may not have intentionally tried to put a label on him, but decided to make him a self centered lazy guy but they happen to give them the traits and not even know it because they weren't thinking of giving him any disability.